MACROCYCLIS. 



53 



Fig. 87. 



each ; centrals very small, short, obtusely tricuspid ; laterals 

 large, with one central, long, and two side, short cusps ; unciui 

 denticulated or serrate. 



Animal nearly white or rather translucent, mottled with small 

 white blotches ; body long and narrow ; 

 upper posterior portion of foot conspicu- 

 ously furrowed. In motion the shell lies 

 perfectly flat on the extreme posterior 

 portion of body, the eye-peduncles stand- 

 ing nearly perpendicularly, and the head 

 with tentacles thrust out some way beyond 

 the base of eye-peduncles ; eyes scarcely . . , , „ ,. ,. , 

 visible ; animal very short posteriorly. enlarged. [Mobse.] 



Fig. 88. 



MACROCYCLIS, Beck. 



Shell thin, widely umbilicated, depressed, striate or wrinkled, 

 color uniform ; whirls 4^-5, the last broad, depressed, moderately 

 deflesed in front ; aperture obliquely ovate ; peristome somewhat 

 thickened or expanded, the margins 

 approximating, the basal shortly re- 

 flexed. 



Animal (of 31. concava) : upper 

 surface grayish, eye-peduncles long, 

 slender, bluish, base dirty-white, color 

 reddish-orange, posterior extremity slightly tinged with the 

 same ; foot narrow, twice as long as the diameter of the shell, 

 tail-pointed, scarcely reaching behind the shell ; 

 other characters as in Helix. Carnivorous. 



Jaw crescentic, ends sharply pointed, an- 

 terior surface striated ; concave margin smooth, 

 with a median projection. 



Animal of ilacrocyclU concava. 



Fig. 89. 



Jaw of iliicrocyclis 

 vancouverensis. 



